COVID-19 second wave in Delhi shows herd immunity against Delta variant difficult: Study
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The severe outbreak of COVID-19 in Delhi this year showed that the Delta variant can infect previously exposed people through a different variant of the coronavirus, highlighting the challenges of reaching herd immunity against the variant, according to an international team of scientists. The study also found that the Delta variant was between 30-70 per cent more transmissible than previous SARS-CoV-2 lineages in Delhi.